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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 185 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.478 + 79 =
  2. 2.318 + 37 =
  3. 3.288 + 89 =
  4. 4.216 + 27 =
  5. 5.426 + 28 =
  6. 6.186 + 37 =
  7. 7.382 + 58 =
  8. 8.282 + 99 =
  9. 9.201 + 49 =
  10. 10.265 + 18 =
  11. 11.490 + 87 =
  12. 12.95 + 39 =
  13. 13.34 + 77 =
  14. 14.369 + 29 =
  15. 15.267 + 78 =
  16. 16.195 + 17 =
  17. 17.222 + 69 =
  18. 18.72 + 77 =
  19. 19.194 + 48 =
  20. 20.494 + 58 =
  21. 21.56 + 39 =
  22. 22.381 + 37 =
  23. 23.31 + 77 =
  24. 24.142 + 38 =
  25. 25.153 + 67 =
  26. 26.293 + 47 =
  27. 27.496 + 99 =
  28. 28.41 + 57 =
  29. 29.267 + 28 =
  30. 30.87 + 69 =
  31. 31.305 + 18 =
  32. 32.402 + 97 =
  33. 33.404 + 17 =
  34. 34.74 + 47 =
  35. 35.245 + 39 =
  36. 36.419 + 19 =
  37. 37.213 + 48 =
  38. 38.174 + 47 =
  39. 39.87 + 69 =
  40. 40.442 + 87 =

Answer key

  1. 557
  2. 355
  3. 377
  4. 243
  5. 454
  6. 223
  7. 440
  8. 381
  9. 250
  10. 283
  11. 577
  12. 134
  13. 111
  14. 398
  15. 345
  16. 212
  17. 291
  18. 149
  19. 242
  20. 552
  21. 95
  22. 418
  23. 108
  24. 180
  25. 220
  26. 340
  27. 595
  28. 98
  29. 295
  30. 156
  31. 323
  32. 499
  33. 421
  34. 121
  35. 284
  36. 438
  37. 261
  38. 221
  39. 156
  40. 529

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